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Railways PYQCBT 1 2020

RRB NTPC · Question 81

Select the number from among the given that can replace the question mark(?) in the following series. 1, 27, 125, 343.?

  1. 216

  2. 625

  3. 729

  4. 999

Show answer & explanation

Answer: (C) 729

Explanation

The terms are cubes of odd numbers: 1³, 3³, 5³, 7³. The next is 9³ = 729.